Vibration dampening device



Nm'. 3, 193i. J. A. FETCH VIBRATION DAMPENING DEVICE Filed March l2, 1950 Q i E f im L /IH 'c/, a@ @www am 45 to rest.

Patented Nov. 3, 1931 l UNITED `s'lerizs PATENT ,o1-"FICE JASON A. FITCH, or YoUNGsTowN, oHIo, Assieivon To' THE GENERAL FIREPROOFING COMPANY, on Yonnesrowiv,` oHIo, A eonronefrionl or 01110 VIBRATION DAMPENINGDEVICE This invention relatesto a vibration dampening device capable of general use but particularly adapted as a support for transcribing machines and the like, and has for its 5` general object to provide a vibration dampening support which is of simple, inexpensive construction and which is thoroughly reli-l able and efficient in use.

In many instances the center of gravity 16 of a transcribing machine or the like is located remotefrom the geometrical center of the machine,.and in this connectionit is a more specific object of the invention to provide a vibration dampening support inclu- "i sive of adjustable means whereby a machine may be supported to most eifectively eliminatepvibration thereof irrespective of the location of the center of gravity of themachine relative to its geometrical center.

With `the foregoing and other. objects in view, the invention consists in the novelfea'- tures of construction, combination and ar rangement of .parts as' will be hereinafter more fully described, illustrated -in the accompanying drawings and de'iined in the appendedclaims.V y 4 In the drawings, whereinlike characters of reference. denote corresponding parts in the different views l f 30 'Figure 1 is a top plan view, partlyvbroken base A in the form of an open top, box-like structure is provided, over `which isdisposed an open bottom, box-like structure B,the top 10 of which constitutes a platform on which a transcribingmachine or the like is adapted A plurality of coil springs are stretched between opposite side `for end walls 12,.12 vof thebase A, 'near the top thereof, in spaced, preferably parallel relation, and on the bottom` 13 of said base, below-each spring 11 and extending contiguous therewith, is secured aV guide member 14 for a plurality Vof adjust-` able spring supports 15.

In the present instance the upper marginal portions of the sides and endsof the base A are turned laterally inward and then downward as indicated at 16 and 17, respectively, to provide stil reinforcing formations or ribs at the open topgof said base to hold the'said sides Aand ends thereof against inward def ormation under theinfluence of load imposed on the springs 11, and the downturned portions 17 of said reinforcements are utilized as a means of attaching the ends of the springs 11y to opposite walls of the base. rlvhpatv is to say, said downturnedportions are apertured and theends of the springs l1 are provided with hook Vformations engaged through said apertures. As will be understood, however, this merely constitutes one convenient and practical means of securing the ends of the springs-to opposite walls` of the base, the said springs, if desired', being secured to said-walls in any otherI suitable manner. p Y v ,y The guide members 14 and the spring supports r15 may be of anysuitable construction. Preferably, howevclyeach guide member is of channel or substantially ',U-shaped cross section havingan-mturned marginal flange 18 at the top `of each of the sides thereof, thereby providing a slot of substantially inverted T-shape. y f

e The spring ,supports 15 preferably are duplicates. of one another. Each consists of a base plate 19 and an arm 20eXtending at right angles therefrom and formed at its .free end with a U-shaped spring seat 21 which is preferably of sufficient width to engage two ormore coils of'a spring 11.

As shown in the drawings, the bases 19 of the spring supports are adapted to be slidably engaged in the slots of the ide members 14 with their arms 20 extending upward into supporting engagement p with the springs 11, the latter resting within the spring seats 21. One or more of the spring supports 15 may be associated 'with each guide member and its related spring, and each spring support preferably is inclusive of a set screw or the like 22 forsecuring same in a desired position of adjustmentralong its related guide member, the latter being Secured to the bottom 18 ofthe base A by welding orin any other' suitable or desired manner.. i' l The box-like structure B is of slightly larger size than the boX-like base structure A so as to be telescopically movable'with respect to the latter structure, and said bOX'- like structure B ma be of any suitable construction. Preferab y, however, the sides and ends 23 'thereof are formed separate from the top or platform portion 10 and are turned inwardly and downwardly, as indicated at 24,-into embracing relation to an upwardly directed Vmarginal flange 25 of said top or platform portion, Vthereby to stif'fen-v and reinforce saidstructure at the top thereof, and for al similar purpose the lower marginal portions of the sides and ends23 preferably are turned inward upon themselves as indicated at 26.

AUpon the inner face of the top 10 are secured a number of guide members 27 1n all respects duplicates of the guide members 14, and in these guide members 27 are ad]ust ably mounted spring engaging members 28 in all respects duplicates of the spring 'supports 15, the arrangement of said guide members 27 being such that they extend in .overlying relation to the springs 11, respectrvely, whenthe box-like structureV is operatively disposed above the base A. Y Y In view of the foregoi g it will be apparent that when the box-like structure B is operatively disposed above the base'A theformer will be yieldably supported through the 1nstrumentality of the spring engaging members 28 upon the springs 11, Vwherebyfthe latter will serve to absorb substantially all vibration resulting from operation of a transcribing or similar machine mounted on top of the platform 10.

As is obvious, the provision for adjustment of the spring supportinor and spring engaging members 15, 28 lof the structures A and B, respectively, enables the springs 11 to be maintained in substantially uniform tension throughout their .lengths irrespective of the'distribution of-'weight upon the platform 10, thereby to provide for most effective vibrationeliminating functioning of the device in any particular instance.

Without further vdescription it is thought that the features and advantages of the in- Vention will be readily apparent to those skilled in the art, and it will of course be understood that changes in the form, proportion and minor details of construction may be resorted to, without departing from the spirit of the invention-and scope of the appended claims.

1. A vibration dampening device comprising a base inclusive of a bottom having a pair ofspaced spring attaching members rising' therefrom, a `coil spring stretched between said members above the bottom, a guide member mounted on said base beneath said 1 spring andextending Acontiguo'nsftoV the latter,"a spring support mounted upon said guide memberand adjustable therealong so as to underlie and support diiferent portions of said spring, and; an object supporting platform supported upon said spring.

f2. vA vibration dampening device comprising a baseinclusive of a bottom having aV pair of spaced springattaching members rising therefrom, a coil spring stretched between said members above the bottom, a channeled guide member mounted on said base beneath said spring and extending contiguous tothe latter, a spring support mounted upon said guide member and adjustable therealong so as to'u'nderlie and support different portions of said spring, means for securing said spring support-'in any position of adjustment thereof along said guide member, and an object supporting platform supported Vupon said SpIlIlg." Y i 3. A vibration dampening device comprising a pair of spaced spring attaching members, a coil spring'stretched between said members, ay platform disposed above said spring,a guide member mounted on said platform and`eXtencling contiguous "to said spring, and a spring' engaginv member mounted on said'guide member for adjustment therealong, said spring engaging member being inclusive of a depending arm provided at its lowerendwith a spring seat. 4. A vibrationdampening device comprising a' 'pair of spaced spring attachingv members, a coil spring stretchedVv between said members, a platform disposed above said spring, a Yguide member mounted on said platform and lextending contiguouslto said spring, andv a spring engaging member mounted on said guide member for adjustment therealong, said spring engaging member being inclusive of a depending arm provided at its lower end with a springseat, and means' for securing said'- spring engaging meinberin any position of adjustment there-v of along said-guide member.

5. AA vibration dampening'device comprising a base inclusive of a bottom having'spaced spring attaching members rising-therefrom, a plurality of coil springs stretched between said members, a guide member mounted on Tibo the base beneath each s ring, a plurality of spring supports adjusta le along each guide member so as to underlie and support different portions of said springs, respectively, an object supporting platform disposed above said springs, a guide member mounted on said platform in overlying relation to each spring, and a plurality of members mounted on each of said guide members for adjustment therealong and inclusive of arms, respective- 1y, depending into platform supporting enn gagement With said springs.

In testimony whereof I hereunto aiX my signature.

JASON A. FITCH. 

